Ce³⁺/Tb³⁺‐coactived NaMgBO3 phosphors toward versatile applications in white LED, FED, and optical anti‐counterfeiting.

Ce3+/Tb3+ co‐doped NaMgBO3 phosphors were successfully synthesized by solid‐state method. Under 381 nm excitation, the cyan emission owing to the 5d → 4f of Ce3+ ions and green emissions arising from the 5D4 → 7FJ (J = 6, 5, 4, and 3) transitions of Tb3+ ions were seen in all the phosphors. Through theoretical analysis, one knows that the energy transfer from Ce3+ to Tb3+ ions with high efficiency of 83.74% was contributed by dipole–dipole transition. Furthermore, the internal quantum efficiency of NaMgBO3:0.01Ce3+,0.03Tb3+ phosphor was 54.28%. Compared with that of at 303 K, the emission intensity of the developed products at 423 K still kept 73%, revealing the splendid thermal stability of the studied phosphors. Through utilizing the resultant phosphors as cyan‐green components, the fabricated white‐LED device exhibited an excellent correlated color temperature of 2785 K, high color‐rendering index of 85.73, suitable luminance efficiency of 25.00 lm/W, and appropriate color coordinate of (0.4279, 0.3617). Aside from the superior photoluminescence, the synthesized phosphors also exhibited excellent cathode‐luminescence properties which were sensitive to the current and accelerating voltage. Furthermore, the NaMgBO3:0.01Ce3+,0.03Tb3+ phosphors with multi‐mode emissions were promising candidates for optical anti‐counterfeiting. All the results indicated that the Ce3+/Tb3+ co‐doped NaMgBO3 phosphors were potential multi‐platforms toward white‐LED, field emission displays, and optical anti‐counterfeiting applications. [ABSTRACT FROM AUTHOR]

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